Development Free function compiling error in C++

Tried to compile a free function (die.cpp and die.h) in Unix terminal and I can't seem to get it to work.

The error:

Code:

Undefined                       first referenced
 symbol                             in file
die()                               /var/tmp//cckddR2X.o
ld: fatal: symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

Die.cpp:

Code:

#include <math.h>
#include <string>
#include <iostream>
#include <fstream>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "die.h"
 
 
 
int die(){
 
        srand (time(NULL));
        int number = rand() % 6 + 1;
 
        return number;
 
}
 

The Die.h:

Code:

#ifndef __DIE_H
#define __DIE_H
 
 
int die();
 
 
#endif

I'm not sure what I'm doing wrong. Did I leave something out of my .h file? Any feedback is appreciated.

 

You need an int main() function in your cpp since your'e trying to run from it. To define it really quickly, just say:

Code:

int main() {
    die()
}

You don't need to put the main function in the header file.

I'm not sure if you actually need this in a .h file, but I usually just put using namespace std;

 

Yup, I am sure adding the main function will do the trick.

"main" function is the first function being executed when you run any C++ program.
(well almost all programming languages have a main sort of function, can be called differently).

 

A main() function is needed, but you also have to make sure you provide the correct signature.

Something like this should do the trick:

Code:

int main(int argc, char *argv[])
{
  printf("The die was cast and the result is %d\n". die()); // To actually see the result of your function

  return 0; // Return code: 0 means the program returned without error.
}